タイトルでお読みになっているのは、文字通り、KPI ドキュメントを実行しようとしたときにログに表示されるエラーです。
ここにある指示に従いました: http://wiki.spagobi.org/xwiki/bin/view/spagobi_server/KPI+Document+Definition
エラーの完全なトレースは次のとおりです。
[http-bio-8080-exec-4] 17 Feb 2016 11:19:02,177 ERROR it.eng.spagobi.engines.kpi.SpagoBIKpiInternalEngine.execute:362 - MODEL INSTANCE IS NULL, CHECK model_node_instance IN DOCUMENT TEMPLATE.!!!!!!!!!!!!!!
[http-bio-8080-exec-4] 17 Feb 2016 11:19:02,177 ERROR it.eng.spagobi.engines.kpi.SpagoBIKpiInternalEngine.execute:468 - Generic Error
java.lang.NullPointerException
at it.eng.spagobi.engines.kpi.SpagoBIKpiInternalEngine.execute(SpagoBIKpiInternalEngine.java:380)
at it.eng.spagobi.analiticalmodel.document.service.ExecuteBIObjectModule.execute(ExecuteBIObjectModule.java:1063)
at it.eng.spagobi.analiticalmodel.document.service.ExecuteBIObjectModule.initNewExecutionHandler(ExecuteBIObjectModule.java:402)
at it.eng.spagobi.analiticalmodel.document.service.ExecuteBIObjectModule.service(ExecuteBIObjectModule.java:138)
at it.eng.spago.dispatching.module.DefaultPage.invokeServiceBusiness(DefaultPage.java:352)
at it.eng.spago.dispatching.module.DefaultPage.nextStep(DefaultPage.java:302)
at it.eng.spago.dispatching.module.DefaultPage.service(DefaultPage.java:202)
at it.eng.spago.dispatching.module.ModuleCoordinator.service(ModuleCoordinator.java:102)
at it.eng.spago.dispatching.httpchannel.AdapterHTTP.service(AdapterHTTP.java:425)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at it.eng.spagobi.utilities.filters.AntiInjectionFilter.doFilter(AntiInjectionFilter.java:33)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at it.eng.spagobi.commons.filters.ProfileFilter.doFilter(ProfileFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at it.eng.spagobi.commons.filters.SpagoBICoreCheckSessionFilter.doFilter(SpagoBICoreCheckSessionFilter.java:82)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at it.eng.spagobi.utilities.filters.EncodingFilter.doFilter(EncodingFilter.java:42)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)